/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.utils.windowing.handler;

import org.apache.iotdb.db.utils.windowing.api.Evaluator;
import org.apache.iotdb.db.utils.windowing.configuration.SlidingSizeWindowConfiguration;
import org.apache.iotdb.db.utils.windowing.exception.WindowingException;
import org.apache.iotdb.db.utils.windowing.runtime.WindowEvaluationTask;
import org.apache.iotdb.db.utils.windowing.window.WindowImpl;

public class SlidingSizeWindowEvaluationHandler extends SlidingWindowEvaluationHandler {

    private final int windowSize;
    private final int slidingStep;

    private int nextTriggerPoint;

    public SlidingSizeWindowEvaluationHandler(
            SlidingSizeWindowConfiguration configuration, Evaluator evaluator) throws WindowingException {
        super(configuration, evaluator);

        windowSize = configuration.getWindowSize();
        slidingStep = configuration.getSlidingStep();

        nextTriggerPoint = windowSize;
    }

    @Override
    protected void createEvaluationTaskIfNecessary(long timestamp) {
        if (data.size() != nextTriggerPoint) {
            return;
        }

        TASK_POOL_MANAGER.submit(
                new WindowEvaluationTask(
                        evaluator, new WindowImpl(data, nextTriggerPoint - windowSize, windowSize)));
        data.setEvictionUpperBound(nextTriggerPoint - windowSize + 1);

        nextTriggerPoint += slidingStep;
    }
}
